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• The value is either true or false which denotes a boolean value
• The value is a numeric value such as 123 or 7
• The value is a String enclosed with either single or double quotes
• The value is null which denotes a null value
• It can be evaluated using the Simple language, which means you can use eg body, header.foo and other Simple tokens. Notice the tokens must be enclosed with ${ }.

Any other value is consider to be a type declaration instead, see next section about pin pointing types for overloaded methods.

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   .bean(OrderService.class, "doSomething(${body}, true)")

The syntax of the parameters is using the Simple expression language so we can use ${ } placeholders to make this more expressive:

   .bean(OrderService.class, "doSomething(${body}, true)")

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have to use ${ } placeholders in the

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body to refer to the message body.

If you want to pass in a null value, then you can explicit define this in the method option as shown below:

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